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Foundation:The most advanced responsive front-end framework in the world. Foundation is the most advanced responsive front-end framework in the world. You can quickly prototype and build sites or apps that work on any kind of device with Foundation, which includes layout constructs (like a fully responsive grid), elements and best practices; UIkIt:A lightweight and modular front-end framework for developing fast and powerful web interfaces. UIkit gives you a comprehensive collection of HTML, CSS, and JS components
which is simple to use, easy to customize and extendable.

Foundation and UIkIt can be categorized as "Front-End Frameworks" tools.

Some of the features offered by Foundation are:

Semantic: Everything is semantic. You can have the cleanest markup without sacrificing the utility and speed of Foundation.

Mobile First: You can build for small devices first. Then, as devices get larger and larger, layer in more complexity for a complete responsive design.

Customizable: You can customize your build to include or remove certain elements, as well as define the size of columns, colors, font size and more.

On the other hand, UIkIt provides the following key features:

LESS - UIkit is developed in LESS to write well-structured, extendable code which is easy to maintain.

Customizer - UIkit's very basic style can be extended with themes and is easy to customize to create your own look.

"Responsive grid" is the top reason why over 155 developers like Foundation, while over 25 developers mention "Complete GUI" as the leading cause for choosing UIkIt.

Foundation and UIkIt are both open source tools. It seems that Foundation with 28.2K GitHub stars and 5.77K forks on GitHub has more adoption than UIkIt with 14.6K GitHub stars and 2.1K GitHub forks.

According to the StackShare community, Foundation has a broader approval, being mentioned in 654 company stacks & 77 developers stacks; compared to UIkIt, which is listed in 45 company stacks and 9 developer stacks.

What is Foundation?

Foundation is the most advanced responsive front-end framework in the world. You can quickly prototype and build sites or apps that work on any kind of device with Foundation, which includes layout constructs (like a fully responsive grid), elements and best practices.

What is UIkIt?

UIkit gives you a comprehensive collection of HTML, CSS, and JS components
which is simple to use, easy to customize and extendable.

What tools integrate with Foundation?

What tools integrate with UIkIt?

Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive, mobile first projects on the web.

Primer

Primer is the basecoat of GitHub, made by nerds just like you who share a passion for HTML and CSS.

Animate.css

It is a bunch of cool, fun, and cross-browser animations for you to use in your projects. Great for emphasis, home pages, sliders, and general just-add-water-awesomeness.

Material Design for Angular

Material Design is a specification for a unified system of visual, motion, and interaction design that adapts across different devices. Our goal is to deliver a lean, lightweight set of AngularJS-native UI elements that implement the material design system for use in Angular SPAs.

Material Design Lite

Material Design Lite (MDL) lets you add a Material Design look and feel to your static content websites. It doesn't rely on any JavaScript frameworks or libraries. Optimized for cross-device use, gracefully degrades in older browsers, and offers an experience that is accessible from the get-go.

Provides common user interface like dialogs, menus, etc. Is modular and hight customisable.
A part from the grid system, is not used directly, but has as layer of abstraction build with web components, and typescript as far as possible with the time and working constraints, to be reused in other projects.

AskNicely uses UIkIt

UI Kit provides so many great features out of the box. It provides all the tools to build a rich interface with very little configuration. Many of the modules are well documented and are relevant to the common trends we are seeing on websites today.

Markus Gebka uses Foundation

I use it for a lot of professional work where I might need more than just a responsive grid. Has a great set of mixins and components and also some nice JS-modules. I love that its so style-agnostic. Really easy to add custom styling.

Kent Steiner uses Foundation

Foundation has been my choice for years over Bootstrap and other similar CSS frameworks due to the naming conventions, well-designed built-in components, and it plays well with React when I'm not using ElementalUI instead.